tor-browser

The Tor Browser
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normal.h (2585B)

      1 /*
      2 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3 *
      4 *  Use of this source code is governed by a BSD-style license
      5 *  that can be found in the LICENSE file in the root of the source
      6 *  tree. An additional intellectual property rights grant can be found
      7 *  in the file PATENTS.  All contributing project authors may
      8 *  be found in the AUTHORS file in the root of the source tree.
      9 */
     10 
     11 #ifndef MODULES_AUDIO_CODING_NETEQ_NORMAL_H_
     12 #define MODULES_AUDIO_CODING_NETEQ_NORMAL_H_
     13 
     14 #include <stdint.h>
     15 #include <string.h>  // Access to size_t.
     16 
     17 #include "api/neteq/neteq.h"
     18 #include "modules/audio_coding/neteq/statistics_calculator.h"
     19 #include "rtc_base/checks.h"
     20 #include "rtc_base/numerics/safe_conversions.h"
     21 
     22 namespace webrtc {
     23 
     24 // Forward declarations.
     25 class AudioMultiVector;
     26 class BackgroundNoise;
     27 class DecoderDatabase;
     28 class Expand;
     29 
     30 // This class provides the "Normal" DSP operation, that is performed when
     31 // there is no data loss, no need to stretch the timing of the signal, and
     32 // no other "special circumstances" are at hand.
     33 class Normal {
     34 public:
     35  Normal(int fs_hz,
     36         DecoderDatabase* decoder_database,
     37         const BackgroundNoise& background_noise,
     38         Expand* expand,
     39         StatisticsCalculator* statistics)
     40      : fs_hz_(fs_hz),
     41        decoder_database_(decoder_database),
     42        background_noise_(background_noise),
     43        expand_(expand),
     44        samples_per_ms_(CheckedDivExact(fs_hz_, 1000)),
     45        default_win_slope_Q14_(
     46            dchecked_cast<uint16_t>((1 << 14) / samples_per_ms_)),
     47        statistics_(statistics) {}
     48 
     49  virtual ~Normal() {}
     50 
     51  Normal(const Normal&) = delete;
     52  Normal& operator=(const Normal&) = delete;
     53 
     54  // Performs the "Normal" operation. The decoder data is supplied in `input`,
     55  // having `length` samples in total for all channels (interleaved). The
     56  // result is written to `output`. The number of channels allocated in
     57  // `output` defines the number of channels that will be used when
     58  // de-interleaving `input`. `last_mode` contains the mode used in the previous
     59  // GetAudio call (i.e., not the current one).
     60  int Process(const int16_t* input,
     61              size_t length,
     62              NetEq::Mode last_mode,
     63              AudioMultiVector* output);
     64 
     65 private:
     66  int fs_hz_;
     67  DecoderDatabase* decoder_database_;
     68  const BackgroundNoise& background_noise_;
     69  Expand* expand_;
     70  const size_t samples_per_ms_;
     71  const int16_t default_win_slope_Q14_;
     72  StatisticsCalculator* const statistics_;
     73 };
     74 
     75 }  // namespace webrtc
     76 #endif  // MODULES_AUDIO_CODING_NETEQ_NORMAL_H_